paper

Resistivity in the Vicinity of a Van Hove Singularity: SrRuO Under Uniaxial Pressure

arXiv:1709.06545 · doi:10.1103/PhysRevLett.120.076602

Abstract

We report the results of a combined study of the normal state resistivity and superconducting transition temperature of the unconventional superconductor SrRuO under uniaxial pressure. There is strong evidence that as well as driving through a maximum at 3.5 K, compressive strains of nearly 1 % along the crystallographic [100] axis drive the Fermi surface sheet through a Van Hove singularity, changing the temperature dependence of the resistivity from above and below the transition region to within it. This occurs in extremely pure single crystals in which the impurity contribution to the resistivity is 100 ncm, so our study also highlights the potential of uniaxial pressure as a more general probe of this class of physics in clean systems.

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